Various
The ultimate manhole covers site
ÖNORM - a standard defined by the Austrian Standards Institute

The site of Austrian standards https://www.austrian-standards.at/en/products-services/oenorm-standards-national-rules/

An example of a cover that carries the standard on the "ultimate manhole covers" site. From this lid the picture that appears in the general section was taken.
There are 49 manhole covers in the site that has this standard mark
Click for all the covers with this standard

Click for the rest of the standards in the site

The ultimate manhole covers site

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